Mr. Money Mustache. I've read every one of his posts dating back to 2011 and I found the site less than a year ago.
I'm not as hardcore as he (very few are) but I've used countless techniques and principles of his to help hack hedonic adaptation as I continue to live frugally (not cheap) while I pursue financial independence before the age of 40-45. Will I get there? Probably not, but I'll be a lot better off in my financial future if I try.